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No. 626,04Q. Patented May 30, I899.

J. B. ROWLANDS. EXPANSION BOLT.

(Application filed Dec. 10, 1897. Renewed Apr. 14, 1899.)

2 Sheets8heet l.

iNo Modal.)

:1'. .LILJILIIILk ll e if v WITNESSES 1 E-NVENTOR %%/%W r wa- ATTORNEY No. 626,040. Patented May 30, I899. J. R. ROWLANDS.

EXPANSION BOLT.

(Applicatioh filed Dec. 10, 1897. Renewed Apr. 14, 1899.) (No Model.) 2 Sheets-Sheet 2.

CCLZI dlllllllllill WITNESSES INVENTOR AT'roRi EY UNITED STATES" PATENT OFFICE.

JOHN R. RO\VLANDS, OF

HOLES, OF SAME PLACE.

EXPANSION-BOLT.

SPECIFICATION forming part of Letters Patent No. 626,040, dated May 30, 1899. Application filed December 10, 1897. Renewed April 14,1899. Serial 110.713.050. (No model.

To (LZZ whom, it may concern:

Be it known that I, JOHN R. ROWLANDS, of Syracuse, in the county of Onondaga, in

the State of New York, have invented newand useful Improvements in Expansion-Bolts, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to that class of boltfasteners which'are usually termed expansion-bolts and are employed for securing a bolt in a socket formed in the wall or other object to which thebol't is to be attached without passing completely through said object.

The invention consists in the combination of a tap-boltformed with a cylindrical screwthreaded portion on the end inserted in the socket and with ahead on its outer end to prevent longitudinal movement of the bolt, the nut formed with flexible stays extending toward the outer end of the bolt, and a smoothfaced wedge surrounding the shank of the bolt and forced between the aforesaid stays by thelongitudinal travel imparted to the nut by the turning of the bolt, as hereinafter more fully described.

In the annexed drawings, Figures 1 and 2 are longitudinal sections of my invention shown in different stages of operation. Fig.

3 shows a preferred form of my invention. Fig. 4 is a detached perspective view of the nut, and Figs. 5 and 6 show the bolt shaped for difiere'nt purposes.

Similar letters of reference indicate corre-- sponding parts. I

a represents a tap-bolt which is formed with a cylindrical screw-threaded portion on the end entering the socket in the wall,- to which the bolt is to be attached. The opposite or outer end of said boltis provided with a head 0; to limit the longitudinal movement of the bolt in the aforesaid socket.

1) denotes the nut, which Iprovide with expansible tongues t 25, extending from the nut toward the outer end of the bolt and formed, with the nut, in one piece of malleable iron or other suitable metal, affording flexibility to said tongues. These tongues constitute stays forlockiug the nut'in the socket formed in the object to which the bolt is to be secured.

c is a smooth-faced wedge or expanderwhich may be formed of a tube or sleeve surrounding the shank of the bolt, but I may form the expander of an enlargement of the shank. of the bolt, which enlargement is tapered to the screw-threaded portion of the bolt, as shown in Fig. 3 of the drawings. In

- either case, however, the end of the expander adjacent to the nut is to be beveled externally, as shown at 0 sufliciently to allow it to enter under the free ends of the stays i, which are to be beveled or tapered internally to form wedging-surfaces, as shown at t.

The described bolt, with its nut and expander, may be used for various purposes. Figs. 1 and 2 illustrate the'use for attaching a plate P to the face of a wall. The operation 'of efiecting said attachment is as fpllows, to wit: First, the requisite number of holes, each of nearly or quite the same diame-,.

ter as the nut b and the expander 25, are to be drilled into the wall to form sockets d for the reception of the required number of bolts with their nuts and expanders. Then a washer of the same thickness as the plate P is to be applied to one of the bolts, and the sleeve 0 slipped over the shank of the'bolt, and the nut I) applied to the screw-threaded end of the bolt. Then the bolt, with its said appurtenances, is forced into one of the sockets (i, so as to cause the head of the bolt to push the washer onto the wall. The bolt is then prevented from moving farther longitudinally by the head thereof bearing on the washer.

In the operation of forcing the nut into the aforesaid socket the normally outward defie'cted tongues t 25 yield to lateral compression incident to their contact with the sides of the socket d, and by said contact the nut is pre- .vented from turning. Then by turning the bolt so as to draw the nut toward the tapering end of the expander the latter enters under the tapering ends of the tongues 25 t and pries the same outward until they become firmly wedged or set into the walls of the socket d, and thereby effectually lock the nuttherein. Then the bolt is to be unscrewed, leaving the nut in the socket. This operation is carried on in each of the sockets required for fastening the plate P, which is provided with bolt-holes corresponding to the sockets. This plate is then placed in its requisite position over the sockets d, and the bolts 0. to be passed through the holes of the plate and into the sockets d and screwed into the nuts until the plate is firmly clamped onto the Wall.

In order to allow the stays if to expand more readily and conform to the interior of the socket (1, so as to obtain a long frictional bearing therein, I form the said stays with transverse grooves 6 adjacent to the nut proper.

The bolt a may be provided with either a hook h or an eye i in lieu of the head a, and thus used for different purposes. This latter form of the bolt is illustrated in Figs. 5 and 6 of the drawings.

It will be observed that by forming the expansible tongues integral with the nut I obtain a self-locking nut.

What I claim as my invention is-- 1. The combination of a tap-bolt formed with a cylindrical screw-threaded portion on the end inserted in the socket and with a head on its outer end to prevent longitudinal movement of the bolt, the nut formed with flexible stays extending toward the outer end of the bolt and a smooth-faced wedge surrounding the shank of the bolt and forced between the stays by the longitudinal movement of the nut as set forth.

2. A self-locking nut consisting of the nut proper formed with flexible tongues extend ing vertically from one end of the nut in combination with a bolt working in said nut and formed with a tapering enlargement back of the screw-threaded portion by which enlargement the aforesaid tongues are expanded to lock the nut as set forth.

3. The combination with the bolt, of a nut formed with expansible rearwardly-extending stays and with transverse grooves in said stays adjacent to the nut, and an expander forced between the bolt and stays by the bolt working in the nut as set forth and shown.

In testimony whereof I have hereunto signed my name this 2d day of December, 1897.

JOHN R. ROVVLA NDS. ['L. S.] Witnesses:

J. J. LAASS, H. B. SMITH. 

